The hub is a barren lifeless mall currently. It needs stuff to give it life.
Jumping
Various emotes
A bar for those who enjoy the roleplay aspect
Lore friendly minigames such as Regicide and cards.
All of the closed doors replaced with the rooms that were supposed to be there, like an Archival that lets you change your name and height.
More NPCs other than shop NPCs to chat too, seems like an easy little lore snippet thing.
Hell, being able to chat with the shop NPCs and to hear their stories is an incredibly easy way to add more depth to the hub.
trophies that you can throw up in the bar from missions accomplished and bosses defeated
VT2 had dorm rooms for the characters with their own personal items, why not add that to Darktide? it’s all stuff that adds depth and would be something pretty cool to unlock as you level, getting better living quarters as you slowly become part of the inquisitors retinue.
Maybe you can purchase drinks at the bar that will give you a buff for the next mission.
There’s so much STUFF that can be done to flesh out this part of the game to make it worth all the bloody loading screens.